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Sodium-ion battery negative electrode material with Ce doped with SnS2 and preparation method of sodium-ion battery negative electrode material

A sodium ion battery and negative electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of finding sodium intercalation materials, large ion radius, etc., and achieve excellent charge and discharge rate performance, high capacity retention rate, shape special effect

Active Publication Date: 2016-04-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with lithium ions, sodium ions have a larger ionic radius (0.102nmvs.0.076nmofLi), which makes it difficult to find suitable sodium intercalation materials.

Method used

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  • Sodium-ion battery negative electrode material with Ce doped with SnS2 and preparation method of sodium-ion battery negative electrode material

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Effect test

Embodiment 1

[0027] A Ce-doped SnS 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0028] 1) SnCl 4 ·5H 2 O was dissolved in deionized water to prepare solution A with a Sn concentration of 0.5mol / L, and the pH of solution A was adjusted to 5, and Ce(NO) 3 Dissolve in deionized water, prepare solution B with Ce concentration of 0.05mol / L, NaS·9H 2 O was dissolved in deionized water to prepare a solution C with an S concentration of 0.8mol / L;

[0029] 2) The solution B, the solution C and the solution A after adjusting the pH value are according to the molar ratio of Sn, S and Ce elements n Sn :n S :n Ce = The ratio of 1.0:2.0:0.005 is uniformly mixed to obtain the mixed solution D;

[0030] 3) Put the mixed solution D into the hydrothermal electrodeposition reaction kettle, seal the hydrothermal kettle, control the volume filling ratio to 50%, the reaction temperature at 70°C, the positive and negative pole voltage...

Embodiment 2

[0034] A Ce-doped SnS 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0035] 1) SnCl 4 ·5H 2 O was dissolved in deionized water to prepare solution A with a Sn concentration of 0.9mol / L, and the pH of solution A was adjusted to 7, and Ce(NO) 3 Dissolve in deionized water, prepare solution B with Ce concentration of 0.25mol / L, and NaS·9H 2 O was dissolved in deionized water to prepare a solution C with an S concentration of 2.0mol / L;

[0036] 2) The solution B, the solution C and the solution A after adjusting the pH value are according to the molar ratio of Sn, S and Ce elements n Sn :n S :n Ce = The ratio of 1.8:4.3:0.01 is uniformly mixed to obtain mixed solution D;

[0037] 3) Put the mixed solution D into the hydrothermal electrodeposition reaction kettle, seal the hydrothermal kettle, control the volume filling ratio to 60%, the reaction temperature to 100°C, the positive and negative pole voltage...

Embodiment 3

[0040] A Ce-doped SnS 2 A preparation method for a negative electrode material for a sodium ion battery, comprising the following steps:

[0041] 1) SnCl 4 ·5H 2 O was dissolved in deionized water to prepare solution A with a Sn concentration of 1.2mol / L, and the pH of solution A was adjusted to 9, and Ce(NO) 3 Dissolve in deionized water, prepare solution B with a Ce concentration of 0.15mol / L, NaS·9H 2 O was dissolved in deionized water to prepare a solution C with an S concentration of 3.0 mol / L;

[0042] 2) The solution B, the solution C and the solution A after adjusting the pH value are according to the molar ratio of Sn, S and Ce elements n Sn :n S :n Ce =The ratio of 2.5:3.3:0.008 is uniformly mixed to obtain mixed solution D;

[0043] 3) Put the mixed solution D into the hydrothermal electrodeposition reaction kettle, seal the hydrothermal kettle, control the volume filling ratio to 60%, control the reaction temperature at 120°C, the positive and negative pole ...

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Abstract

The invention discloses a sodium-ion battery negative electrode material with Ce doped with SnS2 and a preparation method of the sodium-ion battery negative electrode material. The preparation method comprises the following steps: 1, preparing a SnCl4.5H2O solution, a Ce(NO)3 solution and a NaS.9H2O solution; 2, uniforming the solutions obtained in step 1 according to the mole ratio of Sn to S to Ce, namely nSn: nS: nCe= (1.0-2.5): (2.0-4.3): (0.005-0.01), so that a mixed solution D is obtained; 3, placing the mixed solution D in a hydro-thermo-electric deposition reaction still for conducting an arc discharge hydrothermal reaction; 4, conducting filtration, separation and washing, so that a precursor is obtained, and conducting freeze-drying on the precursor, so that the sodium-ion battery negative electrode material with Ce doped with SnS2 is obtained. A product prepared through the preparation method is of a flowerlike structure assembled by nanosheets, the slice layer shape thickness reaches 10-20 nm, the ball-flower shape diameter is about 300-400 nm, under the current density of 100 mA / g, the initial discharge capacity can reach 1493 mAh / g, and after 50 cycles are ended, the capacity is maintained to be 460 mAh / g.

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to a negative electrode material for a sodium ion battery and a preparation method thereof. Background technique [0002] Sodium-ion battery is a new type of electrochemical power source, which has the advantages of abundant raw material resources, low cost, high specific capacity and high efficiency, and is more in line with the requirements of large-scale energy storage applications. It has application potential in improving power utilization efficiency and power quality. At the same time, due to its significant advantages such as high specific capacity, light weight, long life and no memory, it also has a wide range of applications in aerospace, hybrid electric vehicles and portable electronic devices. . In this context, sodium-ion batteries have attracted worldwide attention in recent years, and research on key materials and related technologies has progressed rapi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/054H01M4/1397
CPCH01M4/1397H01M4/364H01M4/5815H01M10/054Y02E60/10
Inventor 殷立雄柴思敏张浩马建中黄剑锋刘长青孔新刚
Owner SHAANXI UNIV OF SCI & TECH
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